ok ok, i wanted to be one of the cool guys so i took the dive and purchased the white LCD/digitizer combo to go along with my super cool white rear housing. i followed ifixit's guide after reading it over ten times and watching acouple youtube videos on iPhone 4 teardowns.

after it was all said and done, i held onto the home/sleep button with my heart pounding at about 2000 beats per minute...I gave it a big sigh of relief when the phone booted up and the LCD beautifully shined my lockscreen. but i guess i spoke to soon since the touch screen wasn't working :T

so i took the phone apart again and doubled checked the digitizer and lcd sockets to be sure that they were secure. i even took out the whole lcd/digitizer again to check for any creases/folds on the ribbon, everything looked a-ok to me. i did some googling and found some similar problems but with the 3GS...but i followed their solutions regardless. tried restarting the phone, still nothing. tried wedging a small piece of paper over the sockets, still nothing.

i'm lost for solutions now. does anybody know of any potential problems that i could have? i hate to think that its a defective part but i e-mailed the seller about it anyways.

oh yeah, someone told me i should wipe the sockets with some alcohol, should i really be doing that?

You can do the alcohol to clean up the connectors but make sure the alcohol is as close to 100% as you can get. Nothing below 95% or else you're just water-damaging it. Aside from that, sounds like the part is defective. Make sure not only the ribbons are secure but also lined up correctly.